Does anyone know if there is an option to allow quick bars to fade out, and then come back in when you mouse over them?? The only option I have found so far is to make them completely transparent. Thank you!!

I do not know how to make the quickbars fade, like you asked, but perhaps this trick will help:

Quickbars - and any keybinds you have saved to them - will continue to work even if the bar is faded out (alpha set to 0) or disabled completely. So, if you don't want a certain quickbar cluttering up your UI, but you happen to have all the keybinds for the abilities on that bar memorized, you can simply disable it and the abilities will still work when you press those keys.